Java / Basic

Java β€” Basic

Learn the toolchain, values, decisions, methods, sequences, and encapsulated objects.

6 lessons Β· No account required

What you will learn

  • Compile and trace complete Java 17 examples.
  • Explain type, range, ownership, and control-flow contracts.

  1. JDK tools, compilation, and launching

    Follow a Java source file through compilation and execution while keeping compiler, runtime, classpath, and version requirements distinct.

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  2. Values, types, and numeric expressions

    Choose representations that preserve the meaning of a value. Understand primitives, references, integer arithmetic, conversion, booleans, Unicode, and null.

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  3. Conditions, loops, and invariants

    Translate decisions and repeated work into control flow whose boundaries and termination can be explained before execution.

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  4. Methods, contracts, and parameter passing

    Build small methods with explicit inputs, results, and failure rules. Explain pass-by-value, scope, overloading, and recursive termination.

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  5. Arrays, strings, and text boundaries

    Work with sequences while distinguishing fixed-size arrays, immutable strings, reference identity, content equality, and Unicode units.

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  6. Classes, objects, and encapsulation

    Model a small stateful object whose constructor and methods protect valid transitions. Distinguish instances, static members, access control, and interface behavior.

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